You mean to want to know how to build chords from scales. This explained in the theory sticky.

Someones knowledge of guitar companies spelling determines what amps you can own. Really smart people can own things like Framus because they sound like they might be spelled with a "y" but they aren't.

Just play notes from the scale that fits the key. If you play a song that's in the key of C, use the C major scale. When you're playing an, for example, F chord, you still use notes from the C major scale. All the notes in the F chord are found in the C major scale, just as all the other chords in the key of C.

Just learn the different positions of the major scale and you'll learn which chords are found inside them. It's called the CAGED-system, google it.